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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81dd596731d5495ed6c0368d92ce8f583cb3b1cbd65cedf3c9e6e97594df9bd5' 
  AND token = 'Ou6x7n7BXGtn75xikgBliae8oESZoBIBwAKZ5OinzPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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