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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dfa9441464d60a23d1a8678ce5556e4c36b9c35bf869ba599cdb24819f50e7c' 
  AND token = 'Q+FL3O/es9sTue5TYg4PFZGwDziLgrv1AGOIenT1dAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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