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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9bdd0bdb1a25092caaf86e4e58383c49472a4c24c3078d4c4297d8a013425b0' 
  AND token = 'rZF3g8qUr8gWfjqPKCLZAjDFkKAMmM7DAnL4zc86au4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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