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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dbf2c4b9f38c24ebde32a93bd0b69cdac938b465f4c0a69348db643f2b7337f' 
  AND token = '/19jMNiV+Vtmu9EOzjAuIN3XwjPXiGpd5yc3lmE5qx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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