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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e2e0078440b45bf6f93faceb3dfcae2f8c787d9edf4b2403baab0f8c4e9fa4' 
  AND token = 'zfipnnnvJNBHNYtPrVN+DR1ICuFUF2n9pyHn3FOzgT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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