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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '438f0b7a5969c403af65e3a1049ac4eb4e2120edebe849fb7f5c0de13b91d27e' 
  AND token = 'rL5cJS6cW1Ni3Bosm0wt8QlT3t8qxuE7WZVT3zwURkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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