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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd140994ac1cf4e870e91c6fc2cf1f95e3e0f8af6523360b1bd0582852986724' 
  AND token = 'eh7lSJy5ccf4kod6mA5nf816BASBHOVI0y9K2riuYj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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