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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af1db3abc54d0a616cff5eb26272455f6073257f43e95bbe0d0ce6a59022e000' 
  AND token = '0WB5z63IPM5GL1Qba6Ib5YUV9VCEUFLv+n+qX2aUJCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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