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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9b912b3175dc931a2b9371d85ca311b620e2ba61f2d980abf00cdb5f7ee86ba' 
  AND token = 'SW3Alz302Yr++EXDV1ZHarBlB6jal1b46+ZlUnuUl+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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