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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f446b4900fcb6825eb2738a6ec7112823fb3e9e005af5aa4a0233e8c1cde56fe' 
  AND token = 'M5bZnlGuYHo/jSsuKC7B4+eheUeHyOlOPG1xrYC/Db0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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