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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '316c718cd81d85ef5aa23a08afff180cfaa2bb1805d23652e31f8d6e517712a7' 
  AND token = '0gnkjpweIY/iNmOHo44gNJY6aQv1Hu4jw4Ob+P3otj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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