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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '903d9ed67458cb57e4c8458129dc0c2a46fcd8cb1132d36e8e5f0f215532d906' 
  AND token = '0H1o9NDswU6JSlnq7U5EUV9kSyhDc4FNZMOFk1U0sVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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