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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1985ad2b2b66f80454c048700ea51e0f1f4abc6de82e895b6026df984381243a' 
  AND token = 'M5XYELqTlvVaDkahN5o7xkToVcD3NOJVMhTYSJ1NGAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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