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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '402c13009c53d3a0de867d1c6d52ac12adc91e0150dc264866ddbdc24b83b478' 
  AND token = 'aiLakk3yrFgvdF0R7d5vxe4G8WZR0iNBlPb4BZVVzzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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