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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74fe3371c982de170d08fa09e5502eb176eef7602311596169ea142f5d519436' 
  AND token = 'yDJTTgJgNmpGd5jd3ue00X+OOfrSXi1YQo/tJSuqTZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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