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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18da07016f72ae26fa776cd89186f9154265d96ee7740f5951dacea7b43626af' 
  AND token = 'GE3KQZ4HYO4cBwwosdStuk53dHkw65CJ2i8ySfoiVBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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