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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d6f5fde6c9fd5d492ead26a4726daf759b846ff6a37438ad0646e9268058d4b' 
  AND token = 'eu/aC8IELugBzl/TKGB1uSsDYYCrblcLIzBOy2QAkoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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