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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '190f525a72d27713d63eda9d1572c6724f13a6d2a95301d3a549f95ae3f8fd9d' 
  AND token = 'WB8nFc4BncVoEdJByvl6Gf/audBxe4MPUipBSDq9PHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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