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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '061f79c92f94fb57ea35072b908c23969219a89a2fead920dbf85ff57c579fc0' 
  AND token = 'aAteqs0DaXZ0bLQeEIzv8UTERvE7JV/jjnlj3oeSUOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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