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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2e801978ec00cadc1be12832e2bc26e409d61cdbb28626268b2ba15a8666ef' 
  AND token = 'T0NHMqOe6/oC/FFk0uPl+QcfNyQqSBpBuug77DZzzg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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