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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34b8171cb7f36b7692d12503bee77cd99f69e03f0ff7cfff1fc02e23bd9c7035' 
  AND token = 'MoNL8dBz7uotLB6pbNK+jfvMZVC7lAZKpDclmV7Q1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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