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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8244c5a748b1c1203e32c8c1679f97cab5043db17a634ae103722fe7ecedf0fd' 
  AND token = 'rDGgbVr4Zujg+yfvktVNQcleEn8dXA19QJO7cntPgKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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