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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c0dab3cd9b4c5cc231d7f06d57c7601a089d3bf68b10ead0329c99d5ccd1f94' 
  AND token = 'saCquZ78X8s7+F4B1aXiiQjkXsPFgHTUnCgZGso1lCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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