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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2da17c3d810b3e3e9154f4268db9b5ba78d65517f6fd0ed897e0e9ae6928cf72' 
  AND token = '0aUaFmd4V+Ir+eapzU8CwXjxZ+3DSWDPXm1oWLsOwes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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