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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91ca77704f304facbf1b74cc5b9c08d49c933d3dc432b479bbe100127c2cbc46' 
  AND token = '6pNIp0CzoEWl00gD+kb0+/WDBJT24Jm8olZ2y4EpYsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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