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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '436e8469ebd30add1ac76a761ae1e9c603696eb5bd975213de92179bf4b11fd6' 
  AND token = 'ZSLPgVLmil7sl8/j9kuKu1GqsufFoF/T/sZjbclRLXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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