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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4714425e7ff260de4d40dc81fe742397ec9d68fd14cf1897d96c4dbef92ae573' 
  AND token = 'n7aI+qk1RD0qzTtfVuFPkksjZUCb5y4S5n8WG6sZsn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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