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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5bf1e9fdb2d9360bc555e450c116b4deaf6b4632bae16b7925efdc42647152' 
  AND token = 'Q6uDIJBe4qfI7XYF/QFmAfe8d+Z64fq8rATr1MDccbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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