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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad31a6f935e6c7b99884e8aafa943befa27e4c52e57e9c6d02e6e8669a76c394' 
  AND token = 'qa0oh0xcOnVFnTVXZ85ibkobg3lInwr32VSkNF2wJ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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