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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b9f428e406a39d01d6df34f731058900b882882dad44a59fa4587eb30ebbddd' 
  AND token = 'z4L0S7Vz3AxdnQ82PgayybzGbKJjHWxL7gbe5MTANRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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