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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b632d4a5ed9248b72a62729eb60c67935ad25df4dbcad9c7d7e2b3e7bef5a46' 
  AND token = 'q1zTL3N+dsLseuzbjJ9zqxDe73xZSW9KJZf38ltU5hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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