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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16ef21e133e93c1b40dfa7cf5130044cdea5ca07deaeab9b019044a45f801ced' 
  AND token = 'DKqCdUAkf7t1mHPwSSMntQivCgQP6ZyOqqk8dVWijhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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