SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be21343fae06103888390196fa39e46c6aa33dac75d7b1125bc25d23f159bd0a' 
  AND token = 'yja0t7Mfpv8L2g4E2p4skcUNb+BgQG+FqHUwnnCmC2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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