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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a29b301f08645a6adeca4d68802203e78933e1d2789a831d764fd006ee077e81' 
  AND token = 'mI2d/KnUy56WAO5pZ7Suu5wd48q2SL2uyW4rFosrKm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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