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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20f50b06360b43ad7001f7f6f8051d2d83ecf966fa062f98d811400947e11263' 
  AND token = 'wsNQHw0HTmw/B/orPGvN8mvtWeMcjZOu64y7AnuhHNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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