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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f79bc69993d8877c056da7d7f2b0976cec8af20dedb0ddbf696ad095119eb42' 
  AND token = 'EgUp7/xvtIX2qP5Wnewct1BlBfccF160WYJfnb0uuPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}