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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26812ad9cc245c8189cae6467bfbba8faebe08b717fd2cebbad0e88cbd0fd1d4' 
  AND token = 'TRwAPPqCJdheSZzBL6oHcI/0mZt4gP9RuDS1oZHaqlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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