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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f296591fbe55869c337ff00b388280d17c053e6571cdf46531b798db4fd9603e' 
  AND token = 'JrMOEpPl3PmJWqWQUS11yGStwMLtylD9VjRGnEGSjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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