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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3efd0d830df9c51f98e88d8030547ab9852f38fe9884b2f4dad657dfd6a82853' 
  AND token = 'VTtFaOqVgAMOgFc6ACQ/o5ih0uVVDlz3vzQ3se7CJro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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