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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef7daa35f00939ac13678e93ec79963a4095d02e067c8160a7ad4217eb78587e' 
  AND token = '1A6uGmZTCWAv3OqqmiqSoY92OJiFO93NlRNhVlMYNlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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