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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36360ae5538921e11bdb6024583844d70e4d80656c515c2a04986ddd2cfbe637' 
  AND token = 'QcN78oHDjwxdnutmUSIYQkVr5XIjp4M4yt+OxT1t93w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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