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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34b72f72d8781f5e38c4fb28edbbd1858daacb55cbb33d3c09f0ad07a9ad31e0' 
  AND token = 'J7jCfj+mwlEfuMlPIDj4ccJVCJlvT2Q3wlWkwgl4ZFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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