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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9259d8e13ca9dd197493410420baaf0f4958555dbe92695737812bfd6801f141' 
  AND token = 'RWjdBNOFss3YufiaphK8aroaTIe8LrxvRKsQuzNQL94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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