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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54a9eeaccd6ea7e59960160f0a860a41aae367415e9c81de0dc69c8799706a09' 
  AND token = 'JpVj/vRcA+8FeCClflNITfi5XnziDi/m53ty+bS7VS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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