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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b79bd6e734aa6d796d49f9a4674f483caa0a8283ea93c830ace082335b4e64d' 
  AND token = '4/QelZcUB9dfnm/grwVWUlcEn/rP8TonZ6CG/H5Alhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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