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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a48fdc85a00a5bb21c5873ca894a4423f779a56cd9df84fb5ade9d7003c3b80b' 
  AND token = 'dB4X4CUbMUM/WfjYvo3NshMtRaAkiC3A90QkFkrxxiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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