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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a83acff1989f5ae4d99ebdbf2fb730e4b64bedd9103c905b4fc3dcb7ab0f5ad' 
  AND token = '7izWOUFlpO6iywNgfTadtd9LirQ8TTVabzTAdYkdozE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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