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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a947470ab6d0705017ad3ee08a9e8d2375e770f878c3afc2482ef9677a24e3f8' 
  AND token = 'E3Bij8hFFsve8HGtC2Nx6ezl7ciRvnRXfgKotaeEU4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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