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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8f73fecf4d66b5e17d4e9acd9f567bd1cbc16f1ffe0e591f1a49804fa69fd1' 
  AND token = '29zmkTpwDI4Q0WqrAiD8eJPkeQfFSN1SkgG77/qIhgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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