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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7592f3cba57b5b81ce667550223d63b2344aeaec9873aad59de64dbb6d3707c8' 
  AND token = 'IkC7/LzgxkoHRKxIPk8L9dOTDW4fYjWYRpll98pfOkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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