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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71e078042f1dc6f43a170a11d782fd83dff343cbe0d4befad5b19bdf7687e620' 
  AND token = 'cMtnvKHNZdKtQtjHtCRNFSvfpA28bZ0gR8KufYkrZrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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