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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15dc4facb5a2808441ed095516715a1e794beb7d695aad688ea7e11cdc20df6f' 
  AND token = 'NTcS0+FAvFQOIp1vJlx8tgA0p+Uw+ziHrLXq3WdrGOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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