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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4309e829c06055dd679e249a610e656183d96db1041c2249ba298eae925bc8de' 
  AND token = 'rdSj8awswSoeZIaG/c8b2ehSQ3oWi9Ul9OboX4BwaRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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