SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '941506b0a2d69829fdbf4fa7640fb64787cf5189160d751b8927f882e259f4dc' 
  AND token = 'nHk5m/PIF6KsmczJ3AvTyzFZ0tnBQ1ltyFt53tUOPsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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