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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f48685e7937a40ba8dc34d5edb62d7a66c7ae43c16c1c56a32e0b539c135a901' 
  AND token = 'P9P+GLyDoZaYOQK7A7iTElTiXE+dc/UMvbPuyr+dBeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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