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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4874d63c98d5691dd58e9920bfed08c7b330371ee535f009b85f1283dcb3fc2' 
  AND token = 'yUUFIcBhH3U1yIzC9JY8r0+Clvu1Ot2TyOdN5e37CSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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