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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb98a9b67599141dac3a9090b5c63df4cfbb7f2e9f8b9975c10a87a383c94a2' 
  AND token = 'ua0VR3p4fJGgry5JoGR7AymBvgQEI2QWFHXOsUYQ6s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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