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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87c8a5e58c51e6574650c41ec6cba3c035f97b1fbfd0a648c3211f6f9a95619' 
  AND token = 'I80JS1hEVTtFuSny4AtsDdnssQVTDMCRBtx9PP9+xUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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